Hi - you could put your questions in your original post so people can read the question with the other information
The SPAD was usually four colour top surfaces with a light blue underside. If I were building it with coloured tissue, I'd choose light blue undereath wings, tail and fuselage and a lightish green on the tops. Then the darker camouflage colours can be painted onto the light green tissue. If you search the net for SPAD XIII picures you'll see the comouflage pattern is almost always the same with individual markings added over it.